Machine for making tapered cement asbestos shingles



'May 24, 1938. A G LEQNARD, JR 2,11%,762

MACHINE FOR MAKING TAPERED CEMENT ASBESTOS SHINGLES Filed July 5, 1936 2Sheets-Sheet 1 17 116726 7 CZrZlzurCZ Leonard J2;

May 24, 1938. LEONARD, J 2,118,762

MACHINE FOR MAKING TAPERED CEMENT ASBESTOS SHINGIJES Filed July 5, 19362 Sheets-Sheet 2 I ImJenZrx-- Qflf/wrGLewzardJr, %%M

lTED E PATENT MACHINE FOR MAKING TAPERED CEMENT ASBESTOS SHINGLESApplication July 3, 1936, Serial No. 88,759

14 Claims.

The invention relates to apparatus for making asbestos shingle stock orany similar material which is formed. by the accumulation of successivelayers and has particular reference tea method of and novel apparatusfor making shingle stock of tapering form.

The invention is particularly concerned with the making of shingle stockfrom asbestos fibers and cement which is transferred as a wet mixturetoan endless cloth band by an operation known as couching in the papermaking art and which forms a relatively thin layer or web ofthe cementasbestos mixture on the endless cloth 1 band. As shown in my Patent No.2,010,308 granted August 6, 1935 an accumulation roll is used on whichthe wet paper-like web of the cement asbestos mixture is accumulateduntil the desired thickness is secured, whereupon the plyboard thusformed is stripped from the roll and delivered to the conveying means.

After the plyboard has been subjected to pressure-to force out most ofthe water and then dried a very satisfactory stock for shingles issecured, which, however, is of uniform thickness throughout.

It is an object of the invention to produce shingle stock of cement andasbestos which will taper in one direction so that the resultingshingles may have a relatively thick butt end. The 30 methodcontemplated by the invention for making tapering cement-asbestos stockconsists in forming in the usual manner a wet paper-like web of thecement asbestos mixture which will be uniform in thickness. Before theweb is de- "3 livered to the accumulation roll a wet cement mixture isapplied to the upper surface of the web in quantities which vary from amaximum to a minimum within a certain length of the web, determined bythe radius of the accumula- 40 tion roll.

Therefore, another object of the invention is to provide noveldistributing means which will spray a wet cement mixture on thetravelling cement-asbestos web and which will alternately 45 accelerateto a maximum speed and then decelerate in timed relation with the travelof the web. With these and various other objects in view the inventionmay consist of certain novel features of construction and operation aswill be 50 more fully described and particularly pointed out in thespecification, drawings and claims appended hereto.

In the drawings which illustrate an embodi-g ment of the invention andwherein like refer- 55 ence characters are used to designate like parts-Figure 1 is a diagrammatic view illustrating apparatus for formingply-board in accordance with the invention;

Figure 2 -is a. fragmentary perspective view showing the distributingapparatus and operat- 5 ing means therefor for applying the wet cementmixture to the web; and

Figure 3 is a longitudinal sectional view of the shingle stock asstripped from the accumulation roll, showing the tapering formation ofthe same. 1

The apparatus for producing the tapering plyboard of the inventionconsists of a vat or container l0; Figure 1, for the cement-asbestosmixture I2, a considerable proportion of the mixture being water so thatthe same can be read- 15 ily transferred from a mixing tank, not shown,to the vat i0. Rotatably journalled within the vat I0 is a drum l3having a peripheryformed by a fine wire mesh fabric. A section of theperiphery of the drum is subjected to vacuum to cause the mixture intank Ill, that is, the

asbestos fiber and cement, to adhere to the wire fabric forming arelatively thin coat on the exterior of the drum. The character of drumabove described is well known and the operation of transferring thematerial adhering to the wire fabric is known as couching.

The endless belt it is suitably supported by roller l5 located directlyover the drum it so that the band contacts the periphery of the drum andpicks up the coating which is deposited on the band as a wet paper-likeweb indicated in Figure 2 by numeral 16. The web travels over a smallsupporting roller ll, over the vacuum means l8, which removes from theweb excess moisture before the web is deposited on the accumulation roll20. The band passes between the accumulation roll 20 and the lowersupporting roller 2i and around small rollers 22, 23 and 24,respectively, when the band again functions to remove the web from thedrum it. The said paper-like web of asbestos fibers and cement is pickedup by the accumulation roll 20 and is accumulated on the roll until thedesired thickness is secured, whereupon the plyboard produced is severedand stripped from the roll. The conveyor 25 conveys the plyboard tohydraulic means, not shown, where the same is pressed to squeeze out theremaining moisture and is subsequently cut into shingle'size and dried.

The apparatus above described will "produce plyboard of uniformthickness, whereas, the plyboard of the invention is of tapering form,as shown in Figure 3, which is a strip as removed from the accumulationroll. The respective ends 26 of said strip and the center 21 have themaximum thickness which tapers toward the points 28 of minimumthickness. The mechanism for applying a coating to the cement-asbestosweb to produce the tapering formation is more particularly shown inFigure 2 and consists of a fountain or supply roller 30 suitablyjournalled for rotation within the fountain 3i, and a distributingroller 32 which is rotated at a relatively high peripheral speedcompared to the surface speed of roller 30 to spray the cement mixtureonto the web IS.

The fountain 3| is supplied with a wet cement mixture which is picked upby the roller 30 and due to the greater peripheral speed of thedistributing roller is discharged from roller 30 and in effect sprayedonto the cement-asbestos web.

' The distributing roller is suitably journalled by shaft 5i and isrotated by motor 52 through the belt 53 which connects pulleys ontherespective members.

The fountain roller so is suitably supported by shaft 33 which is fixedto gear 34 operatively connected by chain 35 with gear 3 6 fixed tocounter-shaft 31. Bearings 38 journal said counter-shaft which isconnected with shaft 40 by pinion 4| and gear'42 on the shaftsrespectively. The elliptical gear 43 meshes with a similar gear 44 fixedto drive shaft 45 suitably journalled by members 46. Fixed to this shaftis a gear 41 operatively connected by the chain 48 andgear 49 with shaft50 carrying the accumulation roll 20. The shaft of the accumulation rollis suitably journalled by arms 5i and said roll is driven by structurenot disclosed since the same forms no part of the present invention.Thus the fountain or supply roller 30 is driven by the accumulation roll20, the drive including the elliptical gears 43 and 44 which haveoperation automatically to vary the speed of rotation of the supplyroller, it being understood, of course, that the accumulation roll isdriven at a constant speed. Whatever the speed of the supply roller someof the wet cement mixture in fountain 3i will be picked up by thesurface of said roller and supplied to the distributing roller 32. Saiddistrib-l uting roller is formed of a plurality of radially extendingwires of uniform length. The material picked up by the surface of thesupply roller is in effect sprayed onto the web IS, the amount appliedbeing greater when the speed of the supply roller 30 is a maximum. Inthis manner certain portions of said web are increased in thickness,thus producing the tapering formation of the shingle stock on theaccumulation roll.

The elliptical gears 43 and 44 in thedrive from the accumulation roll tothe supply roller 30 are so designed that said roller will rotate atvarying speeds, alternating from a maximum speed to a minimum speedwithin a certain length of travel of the web 16. During maximum speed ofthe supply roller the greatest amount of said material is applied to theweb l6 and during the minimum a on the roll.

accumulation roll. Expressed in other words, the roller will completetwo cycles during the travel of a length of web equal to the entirecircumference of the accumulation roll. A cycle in-, cludes a minimumand a maximum speed of operation which occur, periodically and thereforethe portions of the web of increased thickness will be spaced a uniformdistance. Thus, when theweb is wound on' the accumulation roll the thickportions will coincide and also the thin portions will bein alignment."1 As the web continues to accumulate on the'roll 20 the surface of thesame gradually assumes a wavy outline produced by the sections of theweb of-increased thickness with respect to other sections, which areconsiderably thinner as the result of the reduced speed of rotation ofthe roller 30, When the accumulated material on the roll 20 has reachedthe-- desired average thickness the same is automatically severed andstripped from, the

roll, whereupon the length of plyboard produced is conveyed by the means25 to other apparatus for squeezing out the excess moisture, drying thesame, and finally cutting the stock into'shingles. As will be evidentfrom Figure 3, each length of plyboard as stripped from the accumulationroll has two portions of increased thickness which were diametricallyopposite when the stock was In a like manner the samehas two portions ofminimum thickness, also diametrically opposite when on the accumulationroll. The production of shingles of tapering thickness requires that thestock be severed along the dotted lines, as shown in Figure 3, whichwill divide the length of stock into four sections of equal length andwherein each section will have one edge of maximum thickness and theopposite edge of minimum thickness.

The invention is not to be limited to or by details of construction ofthe particular embodiment thereof illustrated by the drawings, asvarious other forms of the device will of course be apparent to thoseskilled in the art without departing from the spirit of the invention orthe scope of the claims.

What is claimed is: g 1. In apparatus for making shingle stock oftapering formation from an asbestos mixture,

the combination with a roll on which said stock is formed by theaccumulation of several layers of web formed from said mixture, of meansfor applying a cement coating to one surface of the web at spacedlocations along the length thereof, said coatings increasing thethickness of said web and being spaced so that two coatings occur withina length of web equal to the circumference of the accumulation roll.

2. In apparatus for making shingle stock of tapering formation from anasbestos mixture, the

' combination with a roll on which'said stock is formed by theaccumulation of several-layers of web formed from said mixture, of meansfor applying a cement coating to one surface of the web at spacedlocations along the length thereof, said coatings increasing thethickness of said web at the locations, and means driving saidcoat saidcoating increasing the thickness of said web 73 at the locations, andmeans driving said coat applying means in timed relation to the travelof the web to thereby thicken the web at points which are equi-distantapart.

4. In apparatus for making shingle stock of tapering formation from anasbestos mixture, the combination with a roll on which said stock isformed by the accumulation of several layers of web formed from saidmixture, of means for applying a cement coating to one surface of theweb at spaced locations along the length thereof, to thereby increasethe thickness of the web at said locations, said means including asupply roller having rotation at varying speeds, and a distributingroller contacting the periphery of the supply roller.

5. In apparatus for making shingle stock having a tapering formation,the combination with a roll on which said stock is formed by theaccumulation of several layers of web having the same composition assaid stock, of means for applying a coating to one surface of the web atspaced locations along its length to increase the thickness thereof atsaid locations, said means including a supply roller, and a distributingroller contacting the periphery of the supply roller, said supply rollerrotating at varying speeds and said distributing roller at all timesrotating at a higher peripheral speed than said supply roller.

6. In apparatus for making shingle stock having a tapering formation,the combination with a roll on-which said stock is formed by theaccumulation of several layers of web having the same composition assaid stock, of means for applying a coating to one surface of the web atspaced locations along its length to increase the thickness thereof atsaid locations, said means including a supply roller, and a distributingroller contacting the periphery of the supply roller, said supply rollerbeing driven at varying speeds from the accumulation-roll.

7. In apparatus for making shingle stock having a tapering formation,the combination with a roll on which said stock is formed by theaccumulation of several layers of web having the same composition assaid stock, of means for applying a coating to one surface of the web atspaced locations along its length to increase the thickness thereof atsaid locations, said means including a supply roller and a distributingroller contacting the periphery thereof, said supply roller rotating atspeeds which periodically vary between a minimum and a maximum and saidrollers at all times rotating at dlfierent periph-- eral speeds.

8. Apparatus for making shingle stock of tapering formation comprisingan accumulation roll on which said stock is formed by the accumulationof several layers of web having the same composition as said stock,coating means for spraying a coating on one surface of the web at spacedlocations along its length to increase the thickness thereof at saidlocations, said means including a supply roller and a distributingroller contacting the periphery thereof, and driving means for thesupply roller, said driving means rotating the supply roller at varyingspeeds.

9. Apparatus for making shingle stock of tapering formation, comprisingan accumulation roll on which said stock is formed by the accumulationof several layers of web having the same composition as said stock,coating means for spraying a coating on one surface of the web at spacedlocations along its length to increase the thickness thereof at saidlocations, said means including a supply roller and a distributingroller contacting the periphery thereof, and means driving the supplyroller from the accumulation roll at speeds periodically varying betweena minimum and a maximum.

10. Apparatus for making shingle stock of tapering formation fromasbestos mixture, comprising an accumulation roll on which said stock isformed by the accumulation of several layers of web formed from saidasbestos mixture, coating means for spraying a coating of cement on onesurface of said web at spaced locations along its length to increase thethickness thereof at said locations, said means including a supplyroller and a distributing roller contacting the periphery thereof, meansdriving said supply roller from the accumulation roll at speedsperiodically varying between a minimum and a maximum, and means rotatingsaid distributing roller at a substantially constant speed, said rollersat all times rotating at different peripheral speeds;

11. Apparatus for making shingle stock of tapering formation fromasbestos mixture, comprising an accumulation roll on which'said stock isformed by the accumulation of several layers of web formed from saidasbestos mixture, coating means for spraying a coating of cement on onesurface of said web at spaced locations along its length to increase thethickness thereof at said locations, said means including a supplyroller and a distributing roller contacting the pe-- riphery thereof,means driving said supply roller from the accumulation roll at speedsperiodically varying between a minimum and a maximum, and

of web formed from said asbestos mixture, coating means for spraying acoating oi cement on one surface ofsaid web at spaced locations alongits length to increase the thickness thereof at said locations, saidmeans including a supply roller and a distributing roller contacting theperoller including means for varying the speed of said roller, and othermeans for rotating the distributing roller at a higher speed than thesupply roller.

13. Apparatus for making shingle stock of tapering formation fromasbestos mixture, comprising an accumulation roll on which said stock isformed by the accumulation of several layers of web formed from saidasbestos mixture, coating means for spraying a coating of cement on onesurface of said web at spaced locations along its length to increase thethickness thereof at said locations, said means including a supplyroller and a distributing roller contacting the periphery thereof, adrive for rotating said supply roller from the accumulation rollincluding means operative to periodically vary the speed of said supplyroller between a minimum and a maximum, and other means for rotatingsalddistributing roller at a higher peripheral speed than said supplyroller.

14. Apparatus for making shingle stock of tapering formation from anasbestos mixture, comriphery thereof, a drive for rotating said supplyprising an accumulation roll on which said stock is formed by theaccumulation of several layers of web'formed from said asbestos mixture,coatof the supply roller, 9. drive for rotating said supply roller fromthe accumulation roll including means operative to periodically vary thespeed of said roller between a minimum and a maximum, and other meansrotating said distributing roller at a relatively high peripheral speed.

ARTHUR G. LEONARD, JR-

